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Development of Novel Silica-Based Formulation of α-Lipoic Acid: Evaluation of Photo and Thermal Stability of the Encapsulated Drug

G. A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences, 153045 Ivanovo, Russia
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Pharmaceutics 2020, 12(3), 228; https://doi.org/10.3390/pharmaceutics12030228
Received: 19 February 2020 / Revised: 2 March 2020 / Accepted: 3 March 2020 / Published: 4 March 2020
(This article belongs to the Section Pharmaceutical Technology, Manufacturing and Devices)
Powerful antioxidant α-lipoic acid (LA) is easily degraded under light and heating. This creates difficulties in its manufacture, storage and reduces efficiency and safety of the drug. The purpose of this work was to synthesize novel silica-based composites of LA and evaluate their ability to increase photo and thermal stability of the drug. It was assumed that the drug stabilization can be achieved due to LA-silica interactions. Therefore, the composites of LA with unmodified and organomodified silica matrixes were synthesized by sol-gel method at the synthesis pH below or above the pKa of the drug. The effects of silica matrix modification and the synthesis pH on the LA-silica interactions and kinetics of photo and thermal degradation of LA in the composites were studied. The nature of the interactions was revealed by FTIR spectroscopy. It was found that the rate of thermal degradation of the drug in the composites was significantly lower compared to free LA and mainly determined by the LA-silica interactions. However, photodegradation of LA in the composites under UV irradiation was either close to that for free drug or significantly more rapid. It was shown that kinetics of photodegradation was independent of the interactions and likely determined by physical properties of surface of the composite particles (porosity and reflectivity). The most promising composites for further development of novel silica-based formulations were identified. View Full-Text
Keywords: α-lipoic acid; silica; drug formulation; drug-silica interaction; photodegradation; thermal degradation; kinetics α-lipoic acid; silica; drug formulation; drug-silica interaction; photodegradation; thermal degradation; kinetics
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MDPI and ACS Style

Dolinina, E.S.; Akimsheva, E.Y.; Parfenyuk, E.V. Development of Novel Silica-Based Formulation of α-Lipoic Acid: Evaluation of Photo and Thermal Stability of the Encapsulated Drug. Pharmaceutics 2020, 12, 228.

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